CrazyBad1外文文献.ppt

# SMS LS “ Crazy Bad ” Beijing: Pollution on Air Thick Smog Engulfs For the past few days, Beijing has been covered by a thick blanket of somg, forcing the closure of several highways and the cancellation of hundreds of flights. According to media reports, hospital admissions have risen by almost a third.The US embassy in the Chinese capital has warned that air quality has reached hazardous levels. Smog is primarily composed of ground-level ozone and fine particulate matter. Particulate matter, or PM, is the term for particles found in the air, including dust, dirt, soot, smoke, and liquid droplets. Particles can be suspended in the air for long periods of time. It’s the main factor affecting air quality and transparency . PM2.5 is one of the most important indicator overlooked in the measuring of fine particles”, which covers particles small enough to penetrate into the deepest recesses of the lungs and do damage there. These can transfer noxious gases and heavy metals directly into the blood. Instead of “PM2.5”, Chinas official readings uses PM 10 -- the much larger particles that can make the sky look dark but are less injurious to people. The @BeijingAir on twitter is the few known source of PM 2.5 readings in China, and it is controversial because its instruments are on the roof of the US Embassy in Beijing. In the Somg The “ Crazy Bad ” Terminology On Nov 2010, this unexpected phrase in US embassys hourly pollution tweet gives its followers cause for amusement and concern. A year later – after been horrified at the frequency of bad and hazardous readings - on?last week, the depth and murkiness of the haze was so appalling that automated system briefly entered the realm of black comedy with another crazy bad analysis of our air again. One day in Beijing The wilder wording of PM2.5 level was probably closer to capturing the danger posed by pollution at these levels. World Health Organisation recommends an upper limit of 10ug/m^3 for PM2.5